[11.01] Ultraviolet Variability in Active Galaxies: A Systematic Survey of the IUE Archives

Now that the mission of IUE has been completed, the Colorado
IUEAGN group is using the TOMSIPS software to systematically
re-extract all of the AGN data in the archives. The spectra
are then fitted with a multi-parameter model in order to
measure continuum and line fluxes. We then compile a
database of fluxes in a number of bands for each
observation.

In this talk, we present continuum variability data for all
AGN with at least 12 SWP observations. These data are
generally sensitive to long-term variations, as the IUE
satellite was operational for almost 20 yr. For certain
objects that were the subjects of intensive monitoring
campaigns (e.g., NGC 5548, NGC 4151, etc.), shorter time
scale data also exist.

We will report the results of a number of studies. First,
for individual well-observed objects, we determine the
relation between variability amplitude and wavelength, on
both long and short time scales. Second, for entire classes
of objects (e.g., Seyfert 1s or BL Lacs), we measure the
correlation between mean object luminosity and variability
amplitude. Finally, we compare the variability properties
of different classes of objects.

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